392 



♦ Ptychoparia(?) johnstoni, n. sp. 



Second species, Etheridge : Proc. Roy. Soc. Tas., 1882 (1883), 

 pp. 157 and 162, pi. i., fig. 10. 



LoganeUus (? ) or Conocephalites (? ), sp., Johnston: Svst. 

 Ace. Geol. Tas., 1888, p. 37. 



Cars. — Glabella slightly pyriform, narrowing posteriorly, 

 its anterior margin separated from the limb-fillet by a wide 

 and deep frontal groove; limb-fillet thick and prominent; 

 axial grooves deep and well marked ; two pairs of pit-like 

 furrows, basal and middle. 



Obs. — Name suggested in memory of the late Mr. R. M. 

 Johnston, Government Statist of Tasmania, etc. This is, in 

 all probability, quite distinct from the original figs. 8, 9, 

 and 11. 



PTYCHOPARIA ( ?) TASMANIENSIS, 11. Sp. 



Fragmentary head shield, allied to Bathyurus, Etheridge: 

 Proc. Roy. Soc. Tas., 1882 (1883), p. 157, pi. i., fig. 12. 



Bathyurus (? ), sp., Johnston: Svst. Ace. Geol. Tas., 1888, 

 p. 37. 



Sp. Chars. — Glabella nearly quadrate, short, blunt 

 anteriorly, but with the margin slightly rounded, expanding 

 very little forwards; fillet of the limb narrow but prominent; 

 fixed cheeks probably broad; neck furrow deep. 



Obs. — Furrows are not visible on this glabella; it is 

 shorter than either of the other forms, and blunter anteriorly. 



In addition to the cephalic portions already described, 

 there occur both in the Caroline Creek beds and those of 

 the Florentine Valley certain pygidia of a very marked 

 character. 



Those from the first locality I tentatively referred to 

 two forms of AsaphusS^) They are nearly semicircular, 

 differing rather in outline, but both with pronounced seg- 

 mented axes, one with ten, the other eight segments. Both 

 have well-marked striated limbs, but in one (fig. 6), the axis 

 enlarges forwards much more rapidly than that of fig. 5. 



The imperfection of the record renders accurate recog- 

 nition of these pygidia difficult. A reference to Bathyurus 

 even is, to some extent, possibly permissible, for although 

 in most species of Bathyurus the pygidial pleurae are seg- 

 mented, in B. saffordi, Billings, ( 49 > only the axis is so, precisely 

 as in the fossils under review. Furthermore, the glabellae, 

 fixed cheeks, etc., are remarkably similar to those of that 

 genus. In the same category stands Asaph iscus, Meek, but 



(48) Etheridge : Proc. Roy. Soc. Tas., 1882 (1883), p. 156. 

 pi. i., figs. 5 and 6. 



(49) Billings : Canadian Pal. Foss., i., 1865, p. 259, fig. 241. 



